Improve the Position of Your Worst Piece
This idea is a good strategy where you cannot see an obvious move. Look at all your pieces. Which one of them is in the worst position. Move it to somewhere better. That could mean move it towards the center, or to a square where it controls more of the center, or it could mean bringing the piece over to attack the enemy, or back towards your King so as to defend your King.
Related Chess Tactics
Read more about these related chess strategies: